diff mbox

[16/25] pxa3xx_nand: update ns2cycle calculation method

Message ID AANLkTilw9YwdJThmCo1l31kF2kSYaiNiFJ3B_sqzY1HX@mail.gmail.com
State New, archived
Headers show

Commit Message

Haojian Zhuang June 18, 2010, 5:35 a.m. UTC 
From 1a69fbe2f0f27f9a77ca425f844acfae525d1338 Mon Sep 17 00:00:00 2001
From: Lei Wen <leiwen@marvell.com>
Date: Fri, 4 Jun 2010 14:10:45 +0800
Subject: [PATCH 16/25] pxa3xx_nand: update ns2cycle calculation method

For the original method change from plus 1 to minus 1,
this way make the default timing like tCS become 0 after calculation,
although we set the timing as 0xa...

Change the method to no plus and minus, and make the result
closer to what the timing specified in the NAND chip spec.

Signed-off-by: Lei Wen <leiwen@marvell.com>
---
 drivers/mtd/nand/pxa3xx_nand.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

 {
diff mbox

Patch

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 1e75df4..bdcc881 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -318,7 +318,7 @@  static const char *mtd_names[] = {"pxa3xx_nand-0",
"pxa3xx_nand-1", NULL};
 #define NDTR1_tAR(c)	(min((c), 15) << 0)

 /* convert nano-seconds to nand flash controller clock cycles */
-#define ns2cycle(ns, clk)	(int)(((ns) * (clk / 1000000) / 1000) - 1)
+#define ns2cycle(ns, clk)	(int)((ns) * (clk / 1000000) / 1000)
 static void pxa3xx_nand_set_timing(struct pxa3xx_nand_info *info,
 				   const struct pxa3xx_nand_timing *t)